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01: /* Copyright (C) 1997-1999,2001,2008,2009,2011 Free Software Foundation, Inc.
02:    This file is part of the GNU C Library.
03: 
04:    The GNU C Library is free software; you can redistribute it and/or
05:    modify it under the terms of the GNU Lesser General Public
06:    License as published by the Free Software Foundation; either
07:    version 2.1 of the License, or (at your option) any later version.
08: 
09:    The GNU C Library is distributed in the hope that it will be useful,
10:    but WITHOUT ANY WARRANTY; without even the implied warranty of
11:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12:    Lesser General Public License for more details.
13: 
14:    You should have received a copy of the GNU Lesser General Public
15:    License along with the GNU C Library; if not, write to the Free
16:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17:    02111-1307 USA.  */
18: 
19: #ifndef _SYS_SELECT_H
20: # error "Never use <bits/select.h> directly; include <sys/select.h> instead."
21: #endif
22: 
23: #include <bits/wordsize.h>
24: 
25: 
26: #if defined __GNUC__ && __GNUC__ >= 2
27: 
28: # if __WORDSIZE == 64
29: #  define __FD_ZERO_STOS "stosq"
30: # else
31: #  define __FD_ZERO_STOS "stosl"
32: # endif
33: 
34: # define __FD_ZERO(fdsp) \
35:   do {                                                                        \
36:     int __d0, __d1;                                                           \
37:     __asm__ __volatile__ ("cld; rep; " __FD_ZERO_STOS                         \
38:                           : "=c" (__d0), "=D" (__d1)                          \
39:                           : "a" (0), "0" (sizeof (fd_set)                     \
40:                                           / sizeof (__fd_mask)),              \
41:                             "1" (&__FDS_BITS (fdsp)[0])                       \
42:                           : "memory");                                        \
43:   } while (0)
44: 
45: #else   /* ! GNU CC */
46: 
47: /* We don't use `memset' because this would require a prototype and
48:    the array isn't too big.  */
49: # define __FD_ZERO(set)  \
50:   do {                                                                        \
51:     unsigned int __i;                                                         \
52:     fd_set *__arr = (set);                                                    \
53:     for (__i = 0; __i < sizeof (fd_set) / sizeof (__fd_mask); ++__i)          \
54:       __FDS_BITS (__arr)[__i] = 0;                                            \
55:   } while (0)
56: 
57: #endif  /* GNU CC */
58: 
59: #define __FD_SET(d, set) \
60:   ((void) (__FDS_BITS (set)[__FD_ELT (d)] |= __FD_MASK (d)))
61: #define __FD_CLR(d, set) \
62:   ((void) (__FDS_BITS (set)[__FD_ELT (d)] &= ~__FD_MASK (d)))
63: #define __FD_ISSET(d, set) \
64:   ((__FDS_BITS (set)[__FD_ELT (d)] & __FD_MASK (d)) != 0)
65: 

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